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18 Cards in this Set

  • Front
  • Back
invertebrate
animal that lacks a backbone
chordate
animal that has for at least one stage of its life, a dorsal, hollow nerve cord, a notochord, a tall that extends beyond the anus, and pharyngeal pouches.
notochord
long supporting rod that runs through a chordate's body just below the nerve cord.
pharyngeal pouch
one of a pair of structures in the throat region of a chordate.
vertebrate
animal that has a backbone
feedback inhibition
process in which a stimulus produces a response that opposes the original stimulus.
radial symmetry
body plan in which any number of imaginary planes drawn through the center of the body could divide it into equal halve
bilateral symmetry
body plan in which a single imaginary line can divide the body into left and right sides that are mirror images of each other
endoderm
innermost germ layer; develops into the linings of the digestive tract and much of the respiratory system.
mesoderm
middle germ layer; develops into muscles, and much of the circulatory, reproductive , and excretory systems.
ectoderm
outermost germ layer; produces sense organs, nerves, and outer layer of skin.
coelom
body cavity lined with mesoderm
pseudocoelom
body cavity, which is only partially lined with mesoderm
zygote
fertilized egg
blastula
hollow ball of cells that develops when a zygote undergoes a series of cell visions
protostome
an animal whose mouth is formed from the blastspore
deuterstome
group of animals in which the blastopore becomes an anus, and the mouth is formed from the second opening that develops.
cephalization
concentration of sense organs and nerve cells at the anterior end of an animal.